1.76 Ga volcano-plutonism in the southwestern Amazonian craton, Aripuana-MT, Brazil: tectono-stratigraphic implications from SHRIMP U-Pb zircon data and rock geochemistry

R.D. Neder, J.A.D. Leite, B.R. Figueiredo, Neal Mcnaughton

    Research output: Contribution to journalArticle

    19 Citations (Scopus)

    Abstract

    Paleoproterozoic felsic and mafic volcanic rocks, extrusive and hypabyssal quartz porphyry, and high-K, A-type epizonal granites dominate the Aripuana region in the southwestern Amazonian craton in the Mato Grosso state of Brazil. The extrusive and intrusive felsic rocks display similar major and trace elements abundance's and equivalent SHRIMP U-Pb ages of 1762-1755 Ma; contacts between them in the field occur gradually. The felsic volcanic activity occurred predominantly as explosive subaqueous volcanism. Various features such as absence of plate collision evidences,. lack of any sign of oceanic crust, lack of complete trends of magmatic differentiation, and bimodal characteristics suggest that the magmatism was intracratonic. The characteristically undeformed felsic igneous rocks were formed by extensional events, probably triggered by mantle activation in an intracratonic 'anorogenic' or post-collisional environment. Throughout the Amazonian craton there are wide areas displaying similar magmatism responsible for the generation of distinctive A-type granites. These A-type granites and associated volcanic rocks yield ages of similar to1.76 Ga, suggesting that they are genetically linked and that there was a unique tectonic mechanism of widespread action in this craton. (C) 2002 Elsevier Science B.V. All rights reserved.
    Original languageEnglish
    Pages (from-to)171-187
    JournalPrecambrian Research
    Volume119
    DOIs
    Publication statusPublished - 2002

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    Volcanic rocks
    Volcanoes
    Geochemistry
    plutonism
    craton
    zircon
    volcano
    geochemistry
    felsic rock
    Rocks
    Igneous rocks
    Quartz
    magmatism
    volcanic rock
    Trace Elements
    Tectonics
    rock
    explosive volcanism
    magmatic differentiation
    Chemical activation

    Cite this

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    title = "1.76 Ga volcano-plutonism in the southwestern Amazonian craton, Aripuana-MT, Brazil: tectono-stratigraphic implications from SHRIMP U-Pb zircon data and rock geochemistry",
    abstract = "Paleoproterozoic felsic and mafic volcanic rocks, extrusive and hypabyssal quartz porphyry, and high-K, A-type epizonal granites dominate the Aripuana region in the southwestern Amazonian craton in the Mato Grosso state of Brazil. The extrusive and intrusive felsic rocks display similar major and trace elements abundance's and equivalent SHRIMP U-Pb ages of 1762-1755 Ma; contacts between them in the field occur gradually. The felsic volcanic activity occurred predominantly as explosive subaqueous volcanism. Various features such as absence of plate collision evidences,. lack of any sign of oceanic crust, lack of complete trends of magmatic differentiation, and bimodal characteristics suggest that the magmatism was intracratonic. The characteristically undeformed felsic igneous rocks were formed by extensional events, probably triggered by mantle activation in an intracratonic 'anorogenic' or post-collisional environment. Throughout the Amazonian craton there are wide areas displaying similar magmatism responsible for the generation of distinctive A-type granites. These A-type granites and associated volcanic rocks yield ages of similar to1.76 Ga, suggesting that they are genetically linked and that there was a unique tectonic mechanism of widespread action in this craton. (C) 2002 Elsevier Science B.V. All rights reserved.",
    author = "R.D. Neder and J.A.D. Leite and B.R. Figueiredo and Neal Mcnaughton",
    year = "2002",
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    1.76 Ga volcano-plutonism in the southwestern Amazonian craton, Aripuana-MT, Brazil: tectono-stratigraphic implications from SHRIMP U-Pb zircon data and rock geochemistry. / Neder, R.D.; Leite, J.A.D.; Figueiredo, B.R.; Mcnaughton, Neal.

    In: Precambrian Research, Vol. 119, 2002, p. 171-187.

    Research output: Contribution to journalArticle

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    AU - Leite, J.A.D.

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    AU - Mcnaughton, Neal

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